SIM7600 with Linux core. How to switch DTB?

Axent1987

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Hello.
I have SIM7600 module with firmware running at Linux core. I dumped 'boot.img' and figured out, that it consists of 10 DTBs inside itself.
But obviously the bootloader loads only one of multiple DTBs.
The global question - How can I set the bootloader to use another DTB??
And how can I modify the existing DTB and implement this to 'boot.img'.??
Thanks
 

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